97results about How to "Improve cladding quality" patented technology

The invention relates to the technical field of repair of blades of a steam turbine, in particular to a vibrating cladding repair technology for damaged last-stage blades of the steam turbine. Firstly, the last-stage blades of the steam turbine are heated at the low temperature, surface defect parts or damaged parts are pre-cleaned and subjected to surface detection and analysis, then, proper technological parameters are selected according to detection results, and the surface defect parts or the damaged parts are subjected to laser cladding under assistance of vibrating stress relief treatment. After cladding, samples are subjected to vibrating stress relief treatment for 20-30 min, and the residual stress of components is further eliminated. By means of the method, the surface defect orthe damaged parts of the last-stage blades of the steam turbine can be effectively repaired, and meanwhile, defects of non-uniform structure and performance distribution and the like caused by non-uniform surface stress of clad layers are overcome.

The invention provides a powder mixing device and a powder mixing method. Multiple paths of to-be-mixed powder carrying airflows respectively enter into an inner chamber of a cover through a plurality of air inlet pipes arranged on the cover, and meanwhile, a vortex blade in the inner chamber of the cover is driven to rotate, namely, a powder-carrying airflow direct mixing manner is adopted for mixing the to-be-mixed powder. Specifically, the vortex blade is used for mixing, the use of multiple connectors is avoided and the possibility of turbulence in the gathering process of multiple paths of airflows is reduced, so that the mixing quality is promoted; the powder-carrying airflows respectively enter into the air inlet pipes so as to complete the mixing of the powder in the powder mixing device, so that the time and labor for manually mixing can be saved, the resource can be saved and the cost can be lowered; the powder mixing device can be mounted at a fusion covering end, the uniformly mixed powder can be directly connected with a fusion covering nozzle through an air outlet pipeline and the laser fusion covering is performed, so that the worse uniformity caused by various unstable factors in the process of conveying after mixing can be avoided and the fusion covering quality is promoted.

The invention provides a repairing method of cracks on a roll surface of a back-up roll of a rolling mill. The repairing method comprises the following steps: (a) pre-treatment of cracks; (b) repairing, namely carrying out fusion covering on a to-be-repaired part through a laser by means of nickel base alloy powder; carrying out a vibration aging treatment, wherein the nickel base alloy powder comprises the following chemical components in percentage by mass: 0.5% of C, 18-20% of Cr, 2-3% of Mo, 0.5-1% of Mn, 2-3% of Si, 3.5-4.5% of Fe, 1.5-3% of W, 1.5-2% of Co, 2-3% of CeO and the balance of Ni; and carrying out fusion covering on rectangular spots in a laminated manner; and (c) post-treatment. The repairing method provided by the invention is used for repairing the cracks on the roll surface by adopting the laser cladding technology without pre-heating. Furthermore, subsequent grinding amount is small without metallurgical cracks, and the hardness can reach the operating requirement of a new roll [HRC (Rockwell Hardness) is over 60].

The invention discloses a laser cladding process molten bath temperature online monitoring device and method. The laser cladding process molten bath temperature online monitoring device comprises an inert gas shielding device, a laser control system, an infrared thermometer clamp, an infrared thermometer and a servo working platform, and further comprises a data acquisition unit connected with theinfrared thermometer and a computer connected with the data acquisition unit. The method comprises the two modes of tracking monitoring and fixed-point monitoring. Through the method, tracking monitoring and online real-time display can be effectively conducted on the molten bath temperature in the laser cladding process, and the temperatures of the quick heating and quick cooling process of a certain fixed-point position can be monitored and displayed on line in real time. In the using process, different methods can be selected according to requirements. The laser cladding process molten bath temperature online monitoring device and method are novel and reasonable in design, convenient to implement and low in cost and lays the foundation for optimizing the laser cladding process and improving the laser cladding quality.

The invention relates to a method used for superspeed laser cladding of an end face of a disc type part. The method comprises the steps that a gap ring I and a gap ring II are mounted on an outer circle and an inner hole of the disc type part in a sleeving manner, and according to process needs, the cladding rate V1, the cladding lap-joint rate eta, laser beam power P and other parameters are set;according to the cladding lap-joint rate eta, the superspeed laser cladding single way width DL and other parameters, a superspeed laser cladding path is planned that a starting point is located on the section line of an inner hole of the end face of the disc type part, and an end point is located on an equal-distance spiral line on the section line of the outer circle of the end face of the discpart; equal-angle joints are mounted at the same time, the equal-distance spiral line is divided into multiple segments of equal-distance spiral line arcs, and through the manner of changing the disctype part rotating angle speed omega i and the superspeed laser cladding head moving speed during superspeed laser cladding of the all segments of equal-distance spiral line arcs, cladding is carriedout, and it is ensured that in the cladding process, the parameters are kept stable; and finally, through a linear cutting manner, the gap ring I, the gap ring II and the disc type part are separated.

The invention discloses an annular hollow offset-focus laser cladding device, and relates to the technical field of laser processing. The annular hollow offset-focus laser cladding device comprises a shell, a conical reflector, an annular off-axis parabolic focus lens, a nozzle and a powder spraying pipe, the top of the shell is provided with a light inlet, the conical reflector is arranged in the shell, and the conical reflector is arranged facing the light inlet; the annular off-axis parabolic focus lens and the conical reflector are oppositely and coaxially arranged; and the nozzle is installed below the conical reflector, the lower end of the nozzle is connected with the powder spraying pipe, the powder spraying pipe is coaxial with annular hollow offset-focus light formed after reflection of the annular off-axis parabolic focus lens, and a collimation protection gas sleeve is arranged on the periphery of the powder spraying pipe. The annular off-axis parabolic focus lens is used for horizontally shifting the focusing focus of the maternal parabola. According to the annular hollow offset-focus laser cladding device, the homogenization of the energy density of an annular light spot is realized, the coupling effect of a laser beam and powder is improved, the utilization rate of the metal powder is improved, and the cladding quality and appearance are improved.

The invention discloses a laser cladding device with an adjustable cladding track and a method for adjusting the width of the cladding track. The laser cladding device comprises a laser cladding head component, a laser, a powder feeder and a central controller, wherein the cladding head is mounted on a vertical adjusting device which can drive the cladding head to move up and down in the vertical direction; a lens is arranged in the cladding head; a powder feeding pipe is mounted on the cladding head through an angle adjusting device which can adjust the included angle between the powder feeding pipe and the cladding head; and a signal transformer, a powder feeding controller and a counter are arranged in the central controller. According to the laser cladding device, the width of the cladding track can be adjusted, the powder conveying quantity and powder feeding angle can be adjusted according to the change of the cladding width while the light spot size changes, fluctuation of height and instability of the section shape of the cladding track are avoided, the laser power density remains unchanged, the thickness of a cladding layer remains unchanged, and the cladding effect is guaranteed.

The invention discloses a screw multifunctional powder feeder for solving the problems in the prior art. The screw multifunctional powder feeder comprises an outer shell and a storage bin hopper arranged on the outer shell. A conveying channel is formed in the outer shell. A screw is arranged in the conveying channel. A power device is connected with one end of the screw. The conveying channel further communicates with a powder outlet. A cleaning powder pressure inlet communicating with the conveying channel is formed in the outer shell. A synchronous powder feeding pressure inlet communicating with the powder outlet is further formed in the outer shell. The cleaning powder pressure inlet and the synchronous powder feeding pressure inlet communicate with an inert gas storage device throughgas pipes. Valves are arranged on the gas pipes correspondingly.

The invention discloses an integrated wide-light-spot deep-hole laser cladding head. The integrated wide-light-spot deep-hole laser cladding head comprises a connection rod, a fixed seat, a powder feeding unit, a cleaning unit, an integral mirror unit, a protective mirror unit, a flow-guide air knife unit, an illumination unit and a camera shooting unit, wherein the connection rod is connected tothe rear end of the fixed seat; the integral mirror unit is installed at the front end of the fixed seat; the powder feeding unit is installed at one side of the fixed seat; the cleaning unit is installed at the other side of the fixed seat; the flow-guide air knife unit is installed at the lower side of the fixed seat and located between the powder feeding unit and the cleaning unit; the protective mirror unit is installed between the fixed seat and the flow-guide air knife unit; the illumination unit is installed on the fixed seat; the camera shooting unit is installed on the connection rod;and the illumination unit is located between the camera shooting unit and the powder feeding unit. According to the integrated wide-light-spot deep-hole laser cladding head, through innovative arrangement for an upper air knife structure and a lower air knife structure, the laser cladding head is effectively protected, and the cladding efficiency is increased; and through innovative arrangement for a camera shooting function, a molten pool, a powder spreading state, and the quality of a cladding surface can be observed in real time, so that an operator can find cladding quality problems in real time.

The invention discloses a sealing process of a turbine rotor blade cover plate top hole of a gas turbine. The process comprises the steps that (1), top hole pre-processing is conducted; (2), a red copper bar cooperates with the top hole is prepared to be used as a lining; (3), the red copper bar is installed at the bottom of the top hole, sealing alloy powder is delivered into the top hole througha coaxial gas carrying powder delivering device to perform laser cladding process, and the path is single-passage and multi-layer; (4), the red copper bar is separated from the cover plate, and castmodification processing is conducted on the cover plate of which the top hole is sealed; (5), nondestructive examination is conducted on the cover plate on which cast modification is conducted. According to the sealing process, a traditional vacuum brazing process is abandoned, a laser cladding technology is adopted to seal the turbine rotor blade cover plate top hole of the gas turbine, metallurgical bonding is formed between the sealing alloy powder and the top hole inner wall, the bonding strength is high, the bonding does not easily fall in the using process, vacuum does not need to be ensured, the sealing cost is low, and the cladding quality is improved by multi-layer clading.

The invention provides a laser cladding nozzle and a laser cladding device and a laser cladding method, and relates to the technical field of laser cladding. The laser cladding nozzle comprises a nozzle outer sleeve, a nozzle wick and a protective cover, the nozzle wick is sleeved with the nozzle outer sleeve, the nozzle outer sleeve is sleeved with the protective cover, and a powder feeding channel is formed between the nozzle outer sleeve and the nozzle wick; the protective cover comprises an inner layer, a middle layer and an outer layer, the inner layer, the middle layer and the outer layer are sequential distributed from inside to outside, a first cavity body is formed between the inner layer and the middle layer, and a second cavity body is formed between the middle layer and the outer layer; and a first liquid inlet opening and a first liquid outlet opening communicating with the second cavity body are formed in the outer layer, a first air inlet opening communicating with the first cavity body is further formed in the outer layer, and a first air outlet opening communicating with the first cavity body is formed in the inner layer. The laser cladding nozzle and the laser cladding device and the laser cladding method have functions of inert gas shielding and self-cooling, can well meet requirements of a laser cladding technology, and promote the quality of laser cladding.

The invention relates to a powder feeding device and a using method thereof and belongs to the technical field of laser cladding. The powder feeding device comprises a fixing part and a powder feeding nozzle, wherein a regulation device is arranged between the fixing part and the powder feeding nozzle and is composed of a horizontal regulation part and a vertical regulation part; and the vertical regulation part is arranged in the horizontal regulation part. The powder feeding device is capable of regulating the distance between a powder outlet and the surface of a substrate, has the characteristics of high regulation accuracy, convenience and rapidness in operation, strong practicability and high economic benefit and is beneficial to improving the effective availability of cladding powder and the cladding quality.

The invention provides a full-automatic heat-shrinkable pipe jacketing machine and a heat-shrinkable pipe jacketing method. The full-automatic heat-shrinkable pipe jacketing machine comprises a heat-shrinkable pipe feeding part, a heat-shrinkable pipe transferring part, a pipe penetrating part and a hot air flow supply part, wherein the heat-shrinkable pipe feeding part is suitable for supplying aheat-shrinkable pipe; the heat-shrinkable pipe transferring part is provided with a fixing rod; the fixing rod is suitable for fixing the heat-shrinkable pipe and transferring the heat-shrinkable pipe to a predetermined pipe penetrating position; the pipe penetrating part is provided with a clamping channel; a first opening of the clamping channel allows a wire harness to be inserted into; a second opening of the clamping channel allows the fixing rod to be pulled out; through holes communicating with the outside are formed in the clamping channel; a limiting unit is arranged on the second opening and is used for limiting the heat-shrinkable pipe at the pipe penetrating position when the fixing rod leaves the clamping channel and feeding and inserting the wire harness into the heat-shrinkable pipe at the pipe penetrating position until a terminal of the wire harness penetrates out of the second opening; hot air flow is supplied into the clamping channel through the through holes, so that the wire harness is fixedly connected with the heat-shrinkable pipe; and the hot air flow supply part is used for supplying the hot air flow to the pipe penetrating part. Therefore, the coating quality of the heat-shrinkable pipe to a conductor terminal can be improved, and the jacketing precision of the heat-shrinkable pipe is improved.

The invention relates to a modified glass material for repairing a carbon/carbon composite material SiC coating based on a laser cladding method as well as a preparation method and a use method of themodified glass material. Borosilicate glass is modified by rare earth element samarium, so that the absorptivity of the material to a laser band covered by an optical fiber laser is remarkably improved; on one hand, the cladding quality of the modified borosilicate glass can be improved, and the oxidation resistance of a repaired carbon/carbon composite material SiC coating sample is improved; and on the other hand, the energy loss of laser can be effectively reduced, and the development goals of greenness, environmental protection and cost saving are achieved.

The invention discloses a cam-driven feed yogurt additive spraying device for meat and poultry breeding. The cam-driven feed yogurt additive spraying device comprises a housing, an additive mixing boxfixedly connected to the upper part of the housing, a circulating blanking device mounted on the left side of the housing and a blanking table arranged in the housing. A rotating shaft is arranged inthe additive mixing box; an elastic mixing mechanism is mounted on the rotating shaft; the rotating shaft is connected with the upper side wall and the lower side wall of the additive mixing box in arotating manner; under the effect of centrifugal force, a metal strip spirally extends out, and cooperates with the action of a mixing plate, so that the homogenization effect of the yogurt additiveis obvious; due to the action of a driving device, a pair of cams can synchronously rotate, so that the blanking table reciprocates in a left-and-right manner and extruded feeds roll on the blanking table, and the coating effect of the extruded feeds and atomized yogurt is improved and uniform, and the quality effect of the feeds is obvious; under the action of the circulating blanking device, theextruded feeds fall down from a discharge pipe in a circulating manner and the coating quality is improved.

The invention belongs to the technical field of wire and cable coating, and particularly relates to a wire and cable coating device capable of improving the product performances. A connecting frame is arranged on a coating pretreatment box and is rotationally connected with a pay-off roller; a burr removing part and a dust removing part are both arranged in the coating pretreatment box; a burr removing filler is arranged in the burr removing part, and dust removing bristles are arranged in the dust removing part; a first guide roller is arranged in the coating pretreatment box; the base is arranged at the right side of the coating pretreatment box and provided with a second guide roller. A coating pool and an electric heating piece are arranged in the coating box; a plurality of groups of guide coating rollers are arranged in the coating pool; the supporting frame is arranged on the coating box, and a storage box is arranged on the supporting frame; a cooling and drying device is arranged on the base and located at the right side of the coating box. A take-up roller is arranged on the base and connected with a take-up motor. The surface quality of wires and cables is improved through pretreatment, the coating effect is ensured, and the cable coating efficiency is high.

The invention discloses a passivation NTO coating quality evaluation method prepared by a supercritical method. The method includes steps of: observing the debonding number of the passivated NTO particles through a magnifying lens, preparing an NTO aqueous solution to detect the pH value, detecting the corrosion degree of the passivated NTO to the Al sheet after preserving heat in a 60 DEG C RH 65% damp and hot environment for 30 days, and classifying the coating quality of the passivated NTO to be poor, IV-grade, III-grade, II-grade and I-grade. The method is mainly used for evaluating the passivation NTO prepared by the supercritical method. The passivated NTO with good coating quality does not show acidity, is suitable for manufacturing Al-containing press-fitting explosives, and does not corrode a metal shell of a warhead. In addition, passivation process parameters can be determined and insensitive agents can be screened by comparing detection values of passivation NTO.

The invention discloses a method for manufacturing molding powder by recycling NTO in waste cast explosives. The method includes: extracting the cast explosive with hot water, and cooling, filtering and drying the cast explosive; washing thecast explosive with methylbenzene, and filtering and drying the cast explosive to obtain an NTO crude product; dissolving the NTO crude product in hot water, dropwise adding a sodium bicarbonate aqueous solution to neutralize residual acid, rapidly cooling and stirring the mixture at a high speed to separate out NTO solid, and filtering and drying the mixture to obtain an NTO recrystallized product; adding NTO with a certain particle size into the adhesive solution to form a suspension, and preparing a shaped coarse powder by adopting a supercritical coating technology; and carrying out programmed heat preservation at the temperature of 70-120 DEG C and 70 DEG C to obtain the NTO-based PBX explosive molding powder. The purity of the recovered NTO isgreater than 99%, the recovery rate is greater than 82%, and the recovery process is simple, green and environment-friendly. According to the method disclosed by the invention, the coating degree ofthe NTO crystal by the adhesive is improved, the thermal safety is improved, and the acid corrosion of NTO to the warhead shell can be prevented.

The invention discloses a method and a nozzle improving a laser cladding effect. According to the method for improving the laser cladding effect, during laser cladding, a mixed gas of helium and nitrogen is delivered into a channel of the nozzle as a protection gas; high-pressure nitrogen is simultaneously delivered into another channel of the nozzle as a protection gas, wherein the gas pressure of the mixed gas is lower than that of the high-pressure nitrogen. According to the technical scheme of the method and the nozzle improving the laser cladding effect, protection gases with no chemical component and different gas pressures are adopted, a powder flow field and a working environment are protected simultaneously, and cladding quality can be greatly improved; multiple protection gas channels are designed in the nozzle, such that multiple protection gases with different components and different gas pressures can be applied in cladding. Therefore, clad layer quality is improved, cracking is reduced, shrinkage loosening is reduced, shrinkage porosity is reduced, and clad layer compactness is improved.